71.   The usual place, Windows on the World in the north tower, was not available.

72.   There no longer was a north tower.

73.   Then he rides the elevators up to his floor, and his desk, which overlooks the north tower of the World Trade Center .

74.   Then the ordinary yielded to the horrific, as the first jetliner slammed into the north tower.

75.   They were traveling from Boston to Los Angeles on the American Airlines jet that hijackers slammed into the north tower.

76.   This elegant property at the foot of the north tower of the Golden Gate Bridge has stood to defend the Bay since the Civil War era.

77.   Through most of both towers, the staircases were tightly clustered, and in the north tower, they were all immediately severed or blocked by the blast.

78.   Two days before his death they went to South Street Seaport, where he pointed to the top of the north tower.

79.   Unfolding at a slower pace, the disaster at the north tower will require study before it can be explained in such detail.

80.   Twenty-five years later, he retired as an elevator starter in the lobby of the north tower.